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Pensions and Other Postretirement Benefits (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Change in plan assets:      
Company contributions $ 39.6 $ 28.7 $ 8.6
Pension Plan [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 639.7 677.3 745.9
Fair value of plan assets at end of year 497.0 489.2 505.6
Funded status of the plans (142.7) (188.1)  
Components of net periodic benefit cost:      
Service cost 5.2 12.7 17.8
Interest cost 21.6 25.3 27.7
Expected return on plan assets (28.8) (29.3) (32.9)
Amortization of net actuarial loss (gain) 11.5 13.8 10.9
Net periodic benefit cost (credit) 12.7 22.9 17.7
Change in plan assets:      
Company contributions 39.6 28.7  
Benefits paid (36.0) (43.8)  
Actual return on plan assets 21.5 37.4  
Foreign currency translation adjustments 6.1 (7.9)  
Other Postretirement Benefits Plan [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 65.9 70.7 75.9
Fair value of plan assets at end of year 0.0 0.0 0.0
Funded status of the plans (65.9) (70.7)  
Components of net periodic benefit cost:      
Service cost 2.0 2.3 2.3
Interest cost 2.1 2.6 2.8
Expected return on plan assets 0.0 0.0 0.0
Amortization of net actuarial loss (gain) (0.3) (0.2) (0.3)
Net periodic benefit cost (credit) 2.4 3.2 $ 3.4
Change in plan assets:      
Company contributions 4.3 3.9  
Benefits paid (4.3) (3.9)  
Actual return on plan assets 0.0 0.0  
Foreign currency translation adjustments 0.0 0.0  
Foreign Plan [Member] | Pension Plan [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 87.6 89.8  
Fair value of plan assets at end of year 96.4 94.8  
Funded status of the plans 8.8 5.0  
Components of net periodic benefit cost:      
Service cost 0.2 0.3  
Interest cost 2.4 3.2  
Expected return on plan assets (5.0) (4.7)  
Amortization of net actuarial loss (gain) 0.8 1.1  
Net periodic benefit cost (credit) (1.6) (0.1)  
Change in plan assets:      
Company contributions 0.9 3.1  
Benefits paid (6.8) (6.6)  
Actual return on plan assets 1.5 10.2  
Foreign currency translation adjustments 6.0 (7.9)  
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]      
Company's Canadian pension and other postretirement benefit plans      
Benefit obligation at end of year 7.3 9.4  
Fair value of plan assets at end of year 0.0 0.0  
Funded status of the plans (7.3) (9.4)  
Components of net periodic benefit cost:      
Service cost 0.0 0.0  
Interest cost 0.3 0.3  
Expected return on plan assets 0.0 0.0  
Amortization of net actuarial loss (gain) 0.0 0.0  
Net periodic benefit cost (credit) 0.3 0.3  
Change in plan assets:      
Company contributions 0.5 0.5  
Benefits paid (0.5) (0.5)  
Actual return on plan assets 0.0 0.0  
Foreign currency translation adjustments $ 0.0 $ 0.0